Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ef73a84dc0d4b6…

MALICIOUS

PDF

152.9 KB Created: 2021-01-15 01:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: b7842f56cdcee531a6bdac90574a522c SHA-1: 3f068ffe19474d0ec1cd01396002fef5b00e1747 SHA-256: b3ef73a84dc0d4b62e10b01d01581210bacc49e80ecfb416b121988daa8bcada
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic and the embedded URL point to a phishing site, likely used to lure users into downloading further malware or submitting credentials. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/aws?utm_term=wpf+listbox+template+selected+item PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486984/normal_5ff926bf91268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ffd615c4b64d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489607/normal_5fd96335aca7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467043/normal_5fdfa228b2365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f8f5e4e8d265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469630/normal_5fef851f8310d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383568/normal_5fdff520cb5bd.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/886e539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463812/normal_5fc396e74989c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/68889906925.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/net_design_guidelines_for_class_library_developers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF6A 5108 bytes
SHA-256: eac6a11ae43aa3dbbc02199163120768e3a21342cf3c26de383a776c4b796396
font_01_sfnt_off000210da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210DA 17960 bytes
SHA-256: 28d9063a76ee464befd57c9becb13a29627c6a6624fa2b83db8ecb0b0b8be2a0
font_02_sfnt_off000245f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x245F0 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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